Locker refrigerating system



7 Sheets-Sheet 1 W. WK. @MRD LoCxER REFRIGERATING SYSTEM Amma April 27, 1

INVENToR. //z/ March 9, 1948 w. McK. BAIBD y 2,437,451

'Loman nmmau'rme sysma Filed April 27, 1944 7 Sheets-Sheet 2 rs1 (4f. [me

INVENTOR WML/AM M6 K//v/.fy 15a/RoL1 ATTORNEY Mmch g, 48.

w. MCK. BAIRD LOGKER REFRIGERATING SYSTEM Filed April 27, 1944 7 Sheets-Sheei 6 ATTOR NE Y '7 Sheets-Sheet 7 W. MSK. BAIRD Filed April 27, 1944 LOCKER REFRIGERATING SYSTEM Manga i?? :NVEN IOR WMA/M c ff/Mfr A//m ATTORNEY mentes s, 194s "i GEBATING SYSTEM 'v me, neas, chica, m.

application April 27. 1944, Serial No. 532,977

lil Claims.

This `invention relates to a portablasectional and expandable reirigerating locker system.

It has long-been a much needed development and a desired objective of the food preservation and the material testing industries to have available a refrigerated locker systeml to freeze, preserve, store and test foods, biologicals, materials, at subfreezing temperatures. ranging from degrees to -100 degrees, Fahrenheit, economically, practically and safely.

In the industrial and commercial fields there are certain biologicals and materials that require a testing and ageing period at very low subireezing temperatures.

in the present operated types of equipment there is either e. refrigerated area known as a locker plant or depot within which the user must enter or a .deep well cabinet opened from the top and requiring that the individual reach into the cabinet to secure the desired stored products.

The present operated plants or depots and the deep well type container utilize ice, dry ice, or a series of pipe coils as the refrigeration media.

The pipe coils are suspended from the ceiling or attached on the surrounding side walls which chills the air. The chilled air gradually descends to the lower levels of the plant or cabinet.

In the material testing operations it has been the general practice to place the biologicals and materials into the deep well type container irrespective of their type for sub-freezing temperature testing. This is undesirable because no seereglation of the biologicals and materials is possib e.

Furthermore. a coating of' ice or other objectionable matter accumulates on the bioiogicals or materials to be tested, thereby counteracting the benefits of the tests at thel sub-freezing temperatures.

To secure foods. biolcgicals and other materials from the plants or depots it is necessary or desirable that the individual user entering the plant wear additional clothing. This additional `cloth-- ing is maintained at the plant or depot by the operator and is exchanged with and between the patrons. This practice is severely criticised and justifiably objected to by the user from a health viewpoint. The objection to this practice has reached such an extent that many patrons have discontinued their patronage. Also, due to the necessity oi the users being required to enter into and expose themselves to the sub-freezing temperatures, many patrons have become sick or injured in health through shock, exposure. chills or freezing.

In these plants or depots spaces for aisles and the foregoing problems and to provide an improved refrigerating locker system unit comprising a plurality ofV sections; that is portable and expandable .by sections: that utilizes forced circulated cold air as a secondary refrigerant; that has solid enclosed drawers which form with the walls of the cabinet, the air ducts in the unit;

that will eliminate the requirements of an individual entering into a cold or sub-freezing temperature area from a warm temperature, thereby preventing sickness due to shock in sudden temperature changes, halting the introduction of undesirable foreign matter or bacteria. stopping the dehydration of meats and perishable products, and -eliminating a coating ci' ice or other objectionable matter on foods, biologicals and other materials, that are being frozen, preserved, stored, tested or aged in sub-freezing temperatures for industrial, commercial or domestic usage.

My invention also contemplates such other objects, advantages and capabilities as will later more fully appear and which are inherently possessed by my invention.

While Ihave shown in the accompanying drawings a preferred form oi' my invention, yet I wish it understood that the same is susceptible of modi fication and change without departing from the spirit of my invention.

. Referring to the drawings, Fig. 1 is a perspec- "tive view of a unit comprising a. primary refrigerant section, a freezer section, a plurality of drawer sections, and an endpanel section; Fig. 2 is a perspective view opposite to the end view shown in Fig. 1; Fig. 3 is a side view of the end panel section; Fig. 4 is an enlarged perspective view of the primary refrigerant section return air baille showing a continuous hinge and, handle attachments: Fig. 5 is a. longitudinal sectional view of the unit comprising a primary refrigerant section, a freezer section, a plurality of drawer sections. and an end panel section taken on line 5-5 of Fig. 1: Fig. 6 is an enlarged transverse sectional view of the preferred primary refrigerant section 'cooling equipment, using a split fin coil, taken on line 6-6 of Fig. 5; Fig. '7 is a plan view of the split fin coil of the primary refrigerant section cooling equipment shown in Figs. 5 and- 6: Fig. 8 is a transverse sectional view through the freezer section, taken on line 3-8 of Fig. 5: Fig. 9 is an enlarged detailed sectional view of the air defiector baille plate in the freezer section taken on line 3-9 of Fig. 8; Fig. 10 is an enlarged detailed cross sectional View of the air deector bafile plate, taken on line i 3-10 of Fig. 9: Fig. 11 is an enlarged detailed cross sectional view of the air guide bales in"the drawer section, taken on line iI-I i of Fig. 8; Fig. 12 is an enlarged detailed plan view of the joining of the sections together, taken on line l2-i2 of Fig. 15; Fig. 13 is an enlarged cross-sectional view of the interior sealing strip, when the sections have been joined together, taken on line |3-I3 of Fig. 12; Fig. 14 is an enlarged cross-sectional view of the exterior sealing strip, when the sections have been joined togethentaken on line I 4-14 of Fig. 15: and Fig. is a top cut-away plan view of the locker system unit composed of a primary refrigerant section, a freezer section, a plurality of drawer sections, an end panel section, showing the circulation of the secondary refrigerant through the split iin coil and being forced circulated by the blower fans through the top ducts and down the vertical ducts formed by the enclosed drawers.

The embodiment selected to illustrate my invention discloses my refrigerating locker system 34 comprising a primary refrigerant section 35,

a freezer section 36, a plurality of drawer sections 31, and an end panel section 33 as shown in Figs. 1 and 2.

Another embodiment of my refrigerating locker system 34, comprises a primary refrigerated section 35. a plurality of drawer sections 31 and an end panel section 38.

The drawer section 31 as illustrated in Figs. 1 and 2, has four drawers in a tier, but a tier may consist of one or more drawers, 39, slidable and withdrawable by the user without the user having to enter the sub-freezing interior of drawer section 31 or refrigerating locker system 34.

It is, of course. within the spirit of my invention that the refrigerating locker system 34 may be smaller or larger and that it may be formed of one or any plurality of drawer sections or can be a combination of any plurality of sections 35, 36, 31 and 38. The tier of drawers as shown of course does not limit the drawer section 31 to four drawers but may be any desirable number of drawers or lockers.

In my refrigerating locker system 34, I prefer to have a double unit with lockers or drawers on eitier side or on both sides as shown in Figs. 1 an 2.

My refrigerating locker system 34 is cooled or sub-freezing temperatures introduced through a primary refrigerant section 35 that removes the heat elements from the air to create cold air as a secondary refrigerant that is introduced into freezer section 36 and locker sections 31 by forced circulation by fans. blowers or other suitable means, wasting the secondary refrigerant or returning it to the primary refrigerant section 35.

I define my secondary refrigerant as cold air from which heat has been extracted and which is circulated by fans, blowers or the like.

The primary refrigerant section 35 comprises two divisions or arcas, an upper insulated area 4I and an uninsulated lower area 42. The upper insulated area 4i has an inner shell 43, an outer shell 44 and closes the space therebetween which is filled with cold resistant insulating material 45 as shown in Figs. 5 and 6.

Aroundthe refrigerator door opening in the upper insulated area 4i is a breaker strip 46 of rubber or other suitable material that is attached to the inner shell 43 and the outer shell 44 as shown in Fig. 5.

The uninsulated lower area 42 is enclosed by the continuation of the outer shell 44 wherein an angle iron frame work 41 is attached to the under side of the upper insulated area 4i by welding or other suitable means. The angle iron framework 41 thereby transmits the Weight of the upper insulated area 4i to a channel iron frame base 43 as shown in Fig. 6.

The secondary refrigerant used for cooling or transmitting sub-freezing temperatures into freezer section 38 and drawer section 31 is forced circulated air that has had the heat units removed in the insulated area 4I of the primary refrigerant section 35 as shown in Figs. 5 and 6.

In operation the secondary refrigerant enters the insulated area 4i of the primary refrigerant section 35 through an intake duct 43 passing upwardly on a slight diagonal into chamber 50. The secondary refrigerant expands in chamber 50 and is then pulled through a split 1in coil 5| by rotating blowers 52a and 52h. whence it is pressure forced through outlet duct 53 into the top horizontal circulating duct 54, and then downwardly into vertical ducts 55, 58, 51 and 58.

The secondary refrigerant then enters into the lower horizontal duct 53 and then through intake duct 43, thereby completing the cycle of circulation as shown in Figs. 5, 6 and 15.

The formation of ducts 55 to 53 inclusive, within the drawer sections 31 involves the construction of the drawers and their positioning with relation to each other and the walls of the section.

My drawer 33 consists of a drawer head 220 and to the rear a spaced container portion 22|, with vertical air space 58 therebetween.

The drawer section 31 comprises an outer shell 3| and an inner shell 32 which closes the space therebetween and which is filled with cold resistant insulating material 45. Around each of the openings of the drawer section 31, is a breaker strip 33 of rubber or other suitable material that is attached to outer shell 3| and inner shell 32 as shown in Figs. 8, 9, 12 and 15.

On each of the opposite sides of inner shell 32 is attached a pair of angle iron frames 34 as structural supporting members with web plates 35 for load stresses.

Centrally located between the two opposite in-v ner shells 32 are a pair of channel iron frames 33 with web plates 91 attached to the top and bottom inner shells 32 by welding or other suitable means.

Attached to angle iron frame 34 and channel iron frame 33 are drawer guide channels 93 for the withdrawal and insertion of drawers 33 as shown in Figs. 8, 9, 10 and 11.

The outer shell li on the bottom of the section 81 is attached to a pair lof angle or channel iron leveling frames 80 as shown in Fig. 9.

Around the edge of inner shell 82 right angie lips are on each side of the section so that when sections are Joined together a rubber interior sealing strip |0i is supermounted to eliminate infiltration or penetration of moisture into insulation material 45, as shown in Figs. 8, 9, 12 and l5.

Each section of the outer shell 8| has an angle lip |02 which abuts the corresponding lip |02 of an adjacent section, and supermounted thereon is an exterior sealing gasket or strip |02.

All sections are Joined together by hexagonal interlocking coupling bolts |04 extending through the outside shell faces 8|, as shown in Fig. 12, or by other suitable means.

When a drawer with an open top position is used in the drawer sections 81 air guide baille plates |05l are placed over the top pair of drawer guide channels 98 and inserted into angle brackets |06 as shown in Figs. 8. 1l and 15.

When drawer 00 is used air guide bailles |05 are not used.

Vertical ducts 50 are formed by the space be tween the back of the drawer headand the front of the drawer container.

Vertical ducts 58 are formed by the space between the backs of oppositely disposed drawers.

Vertical ducts 55 are formed by the space between sides of adjacent drawers.

Vertical ducts 01 are formed by the space between the side of the drawer and the adjacent side of the inner wall of the primary refrigerant section on one end and the inner wall of the end panel section.

Vertical ducts 58, 58, 81 and 58 are each smaller in cross section than horizontal ducts 54 and 58. This construction plus vertical ducts 51 and 58 being smaller in cross section than the other vertical ducts 55 and 58 sets up an obstruction at both ends of horizontal duct 55 and at the locker front openings 58, thereby creating a back pressure causing an evenly distributed flow of the secondary refrigerant through the system 84, as shown in Figs. 5 and 15.

Referring now to the primary refrigerant sections 34, in the upper insulated area 4|, an 'angle iron framework shelf 80 is attached to the inner shell 43. l On this support is positioned a blower motor 8| operating a pulley belt 08 extending between pulleys 82. A pair of spaced brackets 04 also mounted on shelf 80 support a rotating shaft 52e which supports a pair of spaced horizontal discharge blower fans 52a and 52h. The upper pulley 62 engaging shaft 52o rotates it so as to move blower fans 52a and 52h in a counter-clockwise manner.

Also within area, 4i I provide a split iin coil 5i constructed of a plurality of spaced parallel fln coils preferably a pair Bia and 5ib, mounted on the same end ,plates 15. The end plates have right angle portions 18 slidable within spaced brackets 11 attached to the under portion of shelf 60, so that coil 5| is suspended within area. 4i as shown in Figs, 5, 6 and 7.

Each lof the parallel fin coils 5in. and 5|b has an intake orifice 18 and a. return outlet 18.

In the ordinary undivided iln coil heretofore used, the air from duct 49 entering chamber 50 below the coil tends to enter that portion of the coil nearest duct 4'9. This results in the bypassing of the outer portion of the coil so that 6 approximately only one-half the coil is emciently operating. v

, In my construction lia is similar to that portion of a single coil nearest duct 48, and 5ib is i similar to that portion remote from the duct 4l.

My nn coil is split into two sections, lia and lib. I can control the amount or volume of the primary refrigerant or fluid directed into either section as may be desired, and in use I increase the amount or volume of the primary refrigerant or uid through section 5|b and cause the surfaces of section Bib to be colder than the surfaces of section lia.

Because warm air has an amnity towards cold objects, or surfaces. the colder the object, or surfaces, the greater the amnity or attraction. Therefore, by increasing the amo'unt or volume of the primary refrigerant, or fluid, through section lib, over the amount through section 5ia, I m have caused a greater aillnity for the air from chamber 50 to pass through section 5ib than through section 5i a. This results in utilizing the surfaces of the two sections of the nn coii to their maximum capacity and provides a greater emgg ciency in the supplying of the secondary refrigerant at reduced operating cost and time.

Attached to the lower portions of each of the end plates 15 is a guide plate 80 for guiding the secondary refrigerant in chamber 50 direct to coil 5|, thereby preventing the secondary refrigerant from moving around and above coil 5i and bypsing the same.

I provide a drain outlet 18 with a suitable connection on the end, at the bottom of area 4i. 85 Oneach of iin coils 5ia and 5ib is attached at intake oriiloe 18 a thermostatic expansion valve and pot type header 85. At the return outlet 18 of each fin coil'is mounted a thermostatic expansion valve bulb 08, which is connected by lines 805 with thermostatic expansion valve 85.

From each outlet oriilce 18 of each coil Sia and 5| b is a tube connection leading from .area 4i to area 42 and to separate heat exchangers 81. From the two heat exchangers 61, the primary refrigerant enters into condensing unit 14, fully equipped with a suitable motor, magnetic high and low pressure controls and Water inlet, and outlet connections (not shown).

From the condenser 14, the primary refrigerant line passes by silica gel drier 12, solenoid valve 1i, liquid Ignimary refrigerant indicator 68 back into the two heat exchangers 61, from which a line 'leads from each heat exchanger 81 to each of the thermostatic expansion valves and pot type headers 65 completing the cycle. Main electrical control box 88 supplying power of the operation of condenser 14 is shown in Fig. 6 as is also thermostatic control 10.

Between intake duct 49 and chamber 50 is a return air baille 85 hinged to an insulated segregating panel 88 attached to section wall 20|. A handle 81 is pivotally attached by attachment 88 to baille 85. The air baille 85 is held in an open position when handle 81 rests against cleats 89. The return air baille 85 is closed by drawing it forward with handle 81, which is then placed over cleats 80, as shown in Figs. -and 6.

My return air baille 85 is constructed with an outer shell 202, which is filled with cold resistant insulation material 45. Another shell 203 with a surrounding gasket |23 is telesco-ped into shell 202, and held therein by screws 204 extending therethrough, as shown in Figs. 4 and 5.

To defrost the cooling or sub-freezing equip- 75 ment in upper insulated area 4i the condensing unit 14 is. shut of! at electrical junction box 99. The refrigerator doors 200 shown in Fig. 1 are opened and the return air baille 85 is closed. The split iin coil 5| or the cold plates 8| can then be defrosted by spraying with water that drains out of the insulated area 4| through drain connection 13 as shown in Figs. 5 and 6.

The freezer section 36 is substantially the same construction as the drawer section 31 with the following changes:

The freezer section 3B is divided into the freezer compartment |01 and drawer compartment |08. The drawer compartment |08 is otherwise exactly the same as all other drawer sections 31. Around freezer compartment |01 is a vertical enclosure panel |09 attached to the two central channel iron frames 98, and a vertical enclosure panel attached `to the drawer guide channels 90, thereby separating the freezer compartment |01 from the adjoining locker sections. Attached to the vertical enclosure panel I0 are hinges that are attached to an air baille deflector plate ||2. On the opposite side of air baille deilector plate |I2 are baille clips ||3 to which are riveted operating arms ||4 that are riveted to baille push rod I5, that is slidable inv baille push rod brackets i I6 that are attached to drawer guide channels 98. Attached to drawer guide channel Il are angle brackets |08 that support a baille bracket ||1 on which the air deilector baille plate ||2 rests when in a closed position. On the under side of air deflector baille plate I2 are air deflecting angles ||8 as shown in Figs. 1011 and 15. When foods, biologicals, or materials are to be frozen the baille push rod I I is pulled forward which raises the air deflector baille plate ||2 to position at I I9, thereby deflecting all the air from a blower fan 52h down through the freezer compartment |01 into lower horizontal return duct 59 then into intake duct 49 for the freezing cycle in the primary refrigerant section 35, thereby completing the shortest possible secondary refrigerant freezing circuit. In each drawer opening as shown in Fig. 10, for the freezing compartment |01 there are additional angles irons |20 bolted to angle iron frame 94 and channel iron frame 98. Baskets 2| are used in the freezing compartment |01 instead of drawers 39 or drawers 40, as shown in Figs. 5 and 8.

Drawer heads 220 are used in the front openings of freezer compartment |01 of freezer section 36 as a completely removable head or may be fastened on hinges attached to the front face of outside shell 9|.

End panel section 38 comprises an outside shell |2| an inside shell |22, which closes therebetween a space which is i'llled with cold resistant insulating material 45. The lower or bottom face of outside shell |2| is attached to a pair of angles or channel iron leveling frames 99. The end panel section 38 is attachable to adjoining sections by hexagonal interlocking coupling bolts |04 welded on the inside shell |2| as shown in Fig. 3.

Having thus described my invention, I claim:

1. .A refrigerating system comprising a cabinet, a. plurality of tiers of imperforate drawers positioned within said cabinet, each drawer adapted to be slidably withdrawn from and returned into said cabinet from the exterior thereof, each of said tiers of drawers spaced from the ends of the cabinet and the adjacent tier at their sides and backs to provide vertical -passageways, each drawer having aA front panel, and a container portion spacedly attached thereto to provide a vertical passageway in front of the container portion. the top drawers of each tier spaced from the top of said cabinet to provide a horizontal top passageway, the bottom drawers of each tier spaced from the bottom of said cabinet to provide a horizontal bottom passageway. and a primary refrigerant section within said cabinet for cooling air for use as a secondary refrigerant and having means for forcing the secondary refrigerant into said top horizontal passageway, down through said vertical passageways, and thence into said bottom horizontal passageway, said cabinet having an exit passageway leading from said bottom horizontal passageway back to said primary refrigerant section.

2. A refrigerating system comprising a cabinet, a plurality of tiers of imperforate drawers positioned within said cabinet, each drawer adapted to be slidably withdrawn from and returned into said cabinet from the exterior thereof, each of said tiers of drawers spaced from the ends of the cabinet and the adjacent tier to provide vertical passageways, the top drawers of each tier spaced from the top of said cabinet to provide a horizontal top passageway, the bottom drawers of each tier spaced from the bottom of said cabinet to lprovide a horizontal bottom passageway. and a primary refrigerant section within said cabinet for cooling air for use as a secondary refrigerant and having means for forcing the secondary refrigerant into said top horizontal passageway, down through said vertical passageways, and thence into said bottom horizontal passageway, said cabinet having an exit passageway leading from said bottom horizontal passageway back to said primary refrigerant section, the vertical passageway formed with the ends of the cabinet and the adjacent tiers being smaller in cross section than the cross section of the horizontal passageway and also the vertical passageway formed between the tiers.

l 3. A refrigerating system comprising at least one drawer section, a freezer section adjoining one end of said drawer section, a primary refrigerant section adjoining the opposite end of said freezer section for cooling air for use as a secondary refrigerant and having a pair of blowers for forcing the secondary refrigerant into said freezer and drawer sections and, a deilector baille plate positioned in said freezer section to direct split nn coil composed of a pair of spaced coils mounted on said same end plate, one of the spaced coils being more remote than the other from the adjoining drawer section, the coil in the more remote position adapted to receive an increased flow of primary refrigerant fluid.

5. In a refrigerating system, a primary refrigerant section having an insulated portion forming an air chamber and a passage leading to saidair chamber for supplying air thereto, means within said chamber for refrigerating said air, a baille hingedly attached to the innervwall of said chamber and at an angle to said passage for directing the air directly to said refrigerating means, and a nod pivotally attached to said baffle, said chamber having a bottom wall, spaced inner and outer cleats attached to said bottom Wall so that when said rod is moved Aagainst said inner cleat said baille is held in open position and when 9 said rod is moved against said outer cleat the 'baille closes said chamber.

posite to said end panel section, and a primary refrigerant section having closed top, bottom, and end portions and positioned at the other end of said freezer section. said drawer and freezer sections having containers withdrawable from the exterior of the system, each of said sections having an outer shell, an inner shell and insulating material therebetween, each of said sections having aright angle lip on its inner shell for engaging the corresponding right angle lip of an adjoining section, and sealing means supermounted on said engaging lips, each of said sections having a right angle lip on its other shell for engaging the corresponding right angle lip of an adjoining section, and sealing means supermounted on said engaging lips.

7. In a refrlgerating system, at least one drawer section having closed top and bottom portions and open end portions, said drawer section adapted to receive additional drawer sections, an end panel section having closed top, bottom and end portions positioned to close an outer open end of a drawer section, and a primary refrigerant section having closed top, bottom, and end portions positioned to close an open inner end of a drawer section, said drawer section having drawers withdrawable from the exterior of the system, each of said sections having an outer shell, an inner shell and insulating material therebetween, each of said sections having a right angle lip on its inner shell for engaging the corresponding right angle lip of an adjoining section, and sealing means supermounted on said engaging lips, each of said sections.l having a right angle lip on its other shell for engaging the corresponding right -angle lip of an adjoining section, and sealing means supermounted on said engaging lips.

8. A refrigerating system comprising a plurality of drawer sections having closed top and bottom portions and open ends, said drawer sections adapted to be joined together and to receive additional drawer sections, an end panel section having closed top, bottom, and end portions, and positioned to close an open end of one of said drawer sections, a freezer section having closed top, bottom, and end portions, said freezer section positioned with one of its ends adjoining the open end of one of said drawer sections opposite to said end panel section, and a primary refrigerant section having closed top, bottom, and end portions and positioned at the other end of said freezer section, said drawer and freezer sections having containers withdrawable from the exterior of the system, said containers in said drawer sections being imperforate and in a vertical tier, the uppermost of said containers spaced from the top portions of the drawer sections to provide a top horizontal passage, said drawer sections spaced from adjacent drawer sections to provide vertical passageways therebetween, said vertical passageways connecting with said top in each tier spaced from the bottom portions of the drawer sections to provide a bottom horizontal passage, said bottom horizontal passage connecting with vertical passageways, said primary refrigerant section having an inlet passage con` necting with said top horizontal passage, and an outlet passage connecting with said bottom horizontal passage, said primary refrigerant section having an insulated air chamber containing air, means for refrigerating the air, and means for blowing the refrigerated air out said inlet into said top horizontal passage, down said vertical passageways, thence along said bottom horizontal vpassage through said outlet passage to said primary refrigerant section, to complete the cycle.

9. A refrigerated system comprising a plurality of drawer sections having closed top and bottom portions and open ends, said drawer sections adapted to be joined together and to receive additional drawer sections, an end panel section.

having closed top, bottom, and end portions, and positioned to close an open end of one of said drawer sections, and a primary refrigerant section having closed top, bottom and end portions and positioned to close the other open end of said drawer sections, said drawer sections having containers withdrawable from the exterior of the system, said containers in said drawer sections being imperforate and in a vertical tier, the uppermost of said containers spaced from the top portions of the drawer sections to provide a top horizontal passage, said drawer sections spaced from adjacent drawer sections to provide vertical passageways therebetween, said vertical passageways connecting with said top horizontal passage, the lower of said containers in each tier spaced from the bottom portions of the drawer sections to provide a bottom horizontal passage, said bottom horizontal passage connecting with vertical passageways, said primary refrigerant section having an inlet passage connecting said top horizontal passage, and an outlet passage connecting -wiith said bottom horizontal passage, said primary refrigerant section having an insulated air chamber containing air, means for refrigerating the air, and means for blowing the refrigerated air out said inlet into said top horizontal passage, down said vertical passageways, thence along said [bottom horizontal passage through said outlet passage to said primary refrigerant section, to complete the cycle.

10. A refrigerated system comprising a plurality of container sections having closed top and bottom portions and open ends, said container sections adapted to be joined together and to receive additional container sections, an end panel section having closed top, bottom, and end portions, and positioned to close an open end of one of said container sections, and a primary refrigerant section having closed top, bottom and end portions and positioned to close the other open end of said container sections, said container sections having portions accessible from the exterior of the system, said container sections being imperforate and in a vertical tier, the uppermost of said container portions spaced from the top portions ofthe container sections to provide a top horizontal passage, said container sections spaced from adjacent container sections to provide vertical passageways therebetween, said vertical passageways connecting with said top horizontal passage, the lower of said container portions in each tier spaced from the bottom portions of the container sections to provide a bottom horizontal horizontal passage, the lower of said containers 73 passage, said bottom horizontal passage con- 11 necting with vertical passageways, said primary refrigerant section having an inlet passage connecting' with said top horizontal passage, and an outlet passage connecting with said bottom horizontal passage. said primary refrigerant section having an 'insulated air chamber containing air, means for reirigerating the wir, and means for blowing the refrigerated air out said inlet into said top horizontal passage. down said vertical passageways, thence along said bottom horizontal passage through said outlet passage to said primary refrigerant section, to complete the cycle.

WILLIAM McKINLEY BAIRD.

REFERENCES CITED The following references are of record in the file of this patent:

Number UNITED STATES PATENTS Name `Date Y Murphy May 29, 1934 Roberts Bieb. 7, 1939 Warren June 20, 1939 Baird Apr. 23, 1940' Baird Dec. 31, 1940 Baird Oct. 22, 1940 Brown June 17, 1941 Botz Mar. 24, 1942 Yoxsimer Feb. 8, 1944` Quatman May 8, 1945 

